Signed webhooks, with retries and receipts.

• Signed on the way out

  Outbound webhooks are signed; every attempt is an immutable record, and failures are retried.

• One writer per event

  Dispatch is fenced, so no two writers deliver the same event twice.

• Received, verified, deduplicated

  Inbound endpoints verify the provider's signature, deduplicate by delivery id, and answer inside the provider's budget.

Prices are published when billing opens.

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